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SQLAlchemy 1.2 Documentation
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Release: <span class="version-num">1.2.19</span>
| Release Date: April 15, 2019
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<h1>SQLAlchemy 1.2 Documentation</h1>
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<h1>Source code for examples.dogpile_caching.model</h1><div class="highlight"><pre>
<span></span><span class="sd">"""The datamodel, which represents Person that has multiple</span>
<span class="sd">Address objects, each with PostalCode, City, Country.</span>
<span class="sd">Person --(1..n)--> Address</span>
<span class="sd">Address --(has a)--> PostalCode</span>
<span class="sd">PostalCode --(has a)--> City</span>
<span class="sd">City --(has a)--> Country</span>
<span class="sd">"""</span>
<span class="kn">from</span> <span class="nn">sqlalchemy</span> <span class="k">import</span> <span class="n">Column</span>
<span class="kn">from</span> <span class="nn">sqlalchemy</span> <span class="k">import</span> <span class="n">ForeignKey</span>
<span class="kn">from</span> <span class="nn">sqlalchemy</span> <span class="k">import</span> <span class="n">Integer</span>
<span class="kn">from</span> <span class="nn">sqlalchemy</span> <span class="k">import</span> <span class="n">String</span>
<span class="kn">from</span> <span class="nn">sqlalchemy.orm</span> <span class="k">import</span> <span class="n">relationship</span>
<span class="kn">from</span> <span class="nn">.caching_query</span> <span class="k">import</span> <span class="n">RelationshipCache</span>
<span class="kn">from</span> <span class="nn">.environment</span> <span class="k">import</span> <span class="n">Base</span>
<span class="kn">from</span> <span class="nn">.environment</span> <span class="k">import</span> <span class="n">bootstrap</span>
<span class="k">class</span> <span class="nc">Country</span><span class="p">(</span><span class="n">Base</span><span class="p">):</span>
<span class="n">__tablename__</span> <span class="o">=</span> <span class="s2">"country"</span>
<span class="nb">id</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="n">primary_key</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="n">name</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">(</span><span class="mi">100</span><span class="p">),</span> <span class="n">nullable</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">name</span> <span class="o">=</span> <span class="n">name</span>
<span class="k">class</span> <span class="nc">City</span><span class="p">(</span><span class="n">Base</span><span class="p">):</span>
<span class="n">__tablename__</span> <span class="o">=</span> <span class="s2">"city"</span>
<span class="nb">id</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="n">primary_key</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="n">name</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">(</span><span class="mi">100</span><span class="p">),</span> <span class="n">nullable</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
<span class="n">country_id</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="n">ForeignKey</span><span class="p">(</span><span class="s2">"country.id"</span><span class="p">),</span> <span class="n">nullable</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
<span class="n">country</span> <span class="o">=</span> <span class="n">relationship</span><span class="p">(</span><span class="n">Country</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="n">country</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">name</span> <span class="o">=</span> <span class="n">name</span>
<span class="bp">self</span><span class="o">.</span><span class="n">country</span> <span class="o">=</span> <span class="n">country</span>
<span class="k">class</span> <span class="nc">PostalCode</span><span class="p">(</span><span class="n">Base</span><span class="p">):</span>
<span class="n">__tablename__</span> <span class="o">=</span> <span class="s2">"postal_code"</span>
<span class="nb">id</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="n">primary_key</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="n">code</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">(</span><span class="mi">10</span><span class="p">),</span> <span class="n">nullable</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
<span class="n">city_id</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="n">ForeignKey</span><span class="p">(</span><span class="s2">"city.id"</span><span class="p">),</span> <span class="n">nullable</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
<span class="n">city</span> <span class="o">=</span> <span class="n">relationship</span><span class="p">(</span><span class="n">City</span><span class="p">)</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">country</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">city</span><span class="o">.</span><span class="n">country</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">code</span><span class="p">,</span> <span class="n">city</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">code</span> <span class="o">=</span> <span class="n">code</span>
<span class="bp">self</span><span class="o">.</span><span class="n">city</span> <span class="o">=</span> <span class="n">city</span>
<span class="k">class</span> <span class="nc">Address</span><span class="p">(</span><span class="n">Base</span><span class="p">):</span>
<span class="n">__tablename__</span> <span class="o">=</span> <span class="s2">"address"</span>
<span class="nb">id</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="n">primary_key</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="n">person_id</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="n">ForeignKey</span><span class="p">(</span><span class="s2">"person.id"</span><span class="p">),</span> <span class="n">nullable</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
<span class="n">street</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">(</span><span class="mi">200</span><span class="p">),</span> <span class="n">nullable</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
<span class="n">postal_code_id</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="n">ForeignKey</span><span class="p">(</span><span class="s2">"postal_code.id"</span><span class="p">))</span>
<span class="n">postal_code</span> <span class="o">=</span> <span class="n">relationship</span><span class="p">(</span><span class="n">PostalCode</span><span class="p">)</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">city</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">postal_code</span><span class="o">.</span><span class="n">city</span>
<span class="nd">@property</span>
<span class="k">def</span> <span class="nf">country</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">postal_code</span><span class="o">.</span><span class="n">country</span>
<span class="k">def</span> <span class="nf">__str__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="s2">"</span><span class="si">%s</span><span class="se">\t</span><span class="si">%s</span><span class="s2">, </span><span class="si">%s</span><span class="se">\t</span><span class="si">%s</span><span class="s2">"</span> <span class="o">%</span> <span class="p">(</span>
<span class="bp">self</span><span class="o">.</span><span class="n">street</span><span class="p">,</span>
<span class="bp">self</span><span class="o">.</span><span class="n">city</span><span class="o">.</span><span class="n">name</span><span class="p">,</span>
<span class="bp">self</span><span class="o">.</span><span class="n">postal_code</span><span class="o">.</span><span class="n">code</span><span class="p">,</span>
<span class="bp">self</span><span class="o">.</span><span class="n">country</span><span class="o">.</span><span class="n">name</span><span class="p">,</span>
<span class="p">)</span>
<span class="k">class</span> <span class="nc">Person</span><span class="p">(</span><span class="n">Base</span><span class="p">):</span>
<span class="n">__tablename__</span> <span class="o">=</span> <span class="s2">"person"</span>
<span class="nb">id</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">Integer</span><span class="p">,</span> <span class="n">primary_key</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="n">name</span> <span class="o">=</span> <span class="n">Column</span><span class="p">(</span><span class="n">String</span><span class="p">(</span><span class="mi">100</span><span class="p">),</span> <span class="n">nullable</span><span class="o">=</span><span class="kc">False</span><span class="p">)</span>
<span class="n">addresses</span> <span class="o">=</span> <span class="n">relationship</span><span class="p">(</span><span class="n">Address</span><span class="p">,</span> <span class="n">collection_class</span><span class="o">=</span><span class="nb">set</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">name</span><span class="p">,</span> <span class="o">*</span><span class="n">addresses</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">name</span> <span class="o">=</span> <span class="n">name</span>
<span class="bp">self</span><span class="o">.</span><span class="n">addresses</span> <span class="o">=</span> <span class="nb">set</span><span class="p">(</span><span class="n">addresses</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__str__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span>
<span class="k">def</span> <span class="nf">__repr__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="s2">"Person(name=</span><span class="si">%r</span><span class="s2">)"</span> <span class="o">%</span> <span class="bp">self</span><span class="o">.</span><span class="n">name</span>
<span class="k">def</span> <span class="nf">format_full</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="k">return</span> <span class="s2">"</span><span class="se">\t</span><span class="s2">"</span><span class="o">.</span><span class="n">join</span><span class="p">([</span><span class="nb">str</span><span class="p">(</span><span class="n">x</span><span class="p">)</span> <span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="p">[</span><span class="bp">self</span><span class="p">]</span> <span class="o">+</span> <span class="nb">list</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">addresses</span><span class="p">)])</span>
<span class="c1"># Caching options. A set of three RelationshipCache options</span>
<span class="c1"># which can be applied to Query(), causing the "lazy load"</span>
<span class="c1"># of these attributes to be loaded from cache.</span>
<span class="n">cache_address_bits</span> <span class="o">=</span> <span class="p">(</span>
<span class="n">RelationshipCache</span><span class="p">(</span><span class="n">PostalCode</span><span class="o">.</span><span class="n">city</span><span class="p">,</span> <span class="s2">"default"</span><span class="p">)</span>
<span class="o">.</span><span class="n">and_</span><span class="p">(</span><span class="n">RelationshipCache</span><span class="p">(</span><span class="n">City</span><span class="o">.</span><span class="n">country</span><span class="p">,</span> <span class="s2">"default"</span><span class="p">))</span>
<span class="o">.</span><span class="n">and_</span><span class="p">(</span><span class="n">RelationshipCache</span><span class="p">(</span><span class="n">Address</span><span class="o">.</span><span class="n">postal_code</span><span class="p">,</span> <span class="s2">"default"</span><span class="p">))</span>
<span class="p">)</span>
<span class="n">bootstrap</span><span class="p">()</span></pre></div>
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